JPS63212181A - Wheel suspension system for steerable wheel, particularly, rear wheel, of automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention includes a wheel carrier that supports wheels, and this wheel carrier is connected to a vehicle body etc. via a plurality of wheel guide members, and the wheel guide members are connected to each other. The present invention relates to a wheel suspension for a steerable wheel of a motor vehicle, in particular a rear wheel, one of which acts as a tie rod and is movable by a servo motor.

[Prior art and its problems] In the case of wheel suspensions for steerable front wheels, it is customary for a tie rod to act on a steering lever that is fixedly connected to the wheel carrier. In this case, the tie rod is movable substantially in its longitudinal direction and extends substantially transversely to the longitudinal direction of the vehicle.

In the case where the rear wheels can be steered in addition to the front wheels, the above-mentioned structure is also known in principle for the rear wheels in many ways (for example, in West German Patent Application No. 3338389 or West German Patent Application No. 34).
(See Publication No. 46881).

Furthermore, it is known to act on an auxiliary frame supporting the diagonal arm and connected to the vehicle body via rubber elements (see German patent application no. 3437).
(See Publication No. 071). When the operating cylinder is actuated, a limited rotation of the auxiliary frame about the vertical axis and thus of the wheels supported via the diagonal arms is possible. However, this amount of rotation is within the elasticity of the rubber bearing member and is very small.

For reasons of the available installation space and for kinematic and elastic kinematic reasons, it is necessary to provide the transverse arm supporting the carrying spring with other functions, for example. For example, it is necessary to act as a tie rod. Such a transverse arm not only transmits a force in the direction of the arm axis, like a normal tie rod, but also has to transmit an additional force in an approximately vertical direction due to the very large supporting force of the carrier spring. As a result, the actuating member driven by the servo motor, to which the inner end of the transverse arm is pivoted, is subjected to very high forces.

This results in high wear on the pivot connections and requires very large dimensions. Steering transmission devices (hydro cylinders, servo motors, hydro motors,
The load on the second-rank steering system (such as the second-rank steering system) increases friction and leads to undesirable control or response conditions (break horns). Furthermore, a large output is required.

In the case of direct control of the transverse arms, it is very difficult to influence, for example, the steering angle ratio (Ackermann angle) of the wheels on the inside of the curve relative to the wheels on the outside of the curve.

[Purpose of the invention]

The problem underlying the present invention is to provide a servo motor without separate tie rods, with a small space requirement, with the desired response conditions, and without the need to apply excessive force to the operating member of the servo motor.
The object of the invention is to provide a wheel suspension of the type mentioned at the outset.

[Summary of the invention]

According to the present invention, this problem is solved by providing a wheel-1-year for supporting a wheel, this wheel carrier being connected to a vehicle body etc. via a plurality of wheel guide members, one of the wheel guide members acting as a tie rod, and In a wheel suspension for a steerable wheel, in particular a rear wheel, of a motor vehicle, which is movable by a servomotor, the movable wheel guide member carries a spring-supporting arm, the inner end of which The problem is solved in that the intermediate lever is pivotably mounted on a lever, is movable about a pivot axis on the vehicle body, etc., extending at least approximately in the longitudinal direction of the vehicle, and is connected to a servomotor. As a result, the vertical force transmitted from the carrier spring to the arm is absorbed by the intermediate lever without being directed to the operating member of the servo motor. At this time, the posture of the intermediate lever also prevents the lateral force caused by the carrier spring, which is inclined when viewed from the vertical direction.
It can be selected so that it does not act on the servo motor at least in the normal position of the vehicle. An intermediate lever allows changing the force transmission ratio between the servo motor and the arm. Thereby, the load on the steering device and the required operating force can be reduced. Furthermore, when the actuation of the servo motor is controlled, the stroke transmission ratio can be varied by increasing the control distance, which can lead to control technology advantages.

Furthermore, by appropriately selecting the angle of the intermediate lever on the single axle, the wheel on the inside of the curve can steer more than the wheel on the outside of the curve, thus fully utilizing the lateral force potential of both axles. It can be used for.

〔Example〕

The invention and other preferred details will be explained in more detail below on the basis of several exemplary embodiments shown in the figures.

The wheel suspension shown in FIG. 1 is for the steerable rear wheel 1 of a motor vehicle. The wheel carriers 2, each supporting a wheel 1, have an upper triangular transverse arm 3;
It is connected by a lower transverse arm 6 formed by two single arms 4, 5 to a vehicle body 7, shown suggestively. The above-mentioned arm can be indirectly connected to the vehicle body 7 when it is pivotally connected to the subframe l, etc.

The subframe itself may be fixedly connected to the vehicle body, or may be connected to the vehicle body via a rubber element.

Joint 8 on the wheel carrier side of the lower arms 4, 5.
9 are spaced apart from one another in the longitudinal direction, a lateral movement, for example of the arm 5, leads to a steering movement of the wheel carrier 2 and thus of the wheels l.

As can be seen, the arm 5 supporting the carrier spring 10 is laterally movable and its inner end is indirectly connected to the vehicle body. The inner end 11 of the arm 5 is pivotally connected to an intermediate lever 12, which is swingable around a swing line 13 on the vehicle body 7 extending substantially in the longitudinal direction of the vehicle. Each intermediate lever 12 is connected to a servo motor 14. This servo motor is supported by the vehicle body 7, etc.
It can be constructed by a hydro cylinder, a hydro motor, an electric servo motor, a rack steering mechanism or a lever transmission.

The servo motors 14 shown in the figure are each connected to the intermediate lever 12 via a lateral tie rod 15.

As can be seen, the end of the intermediate lever 12 opposite the vehicle body 7 is connected to a servo motor 14 via a tie rod 15, and its central region is connected to the laterally movable arm 5. By varying the respective spacing of the pivot points of the arm 5 and the tie rod 15 from the rJj axis of motion 13, the aforementioned force transmission ratio or stroke transmission ratio can be determined within wide limits.

When the intermediate lever 12' is provided with an elongated hole 16 extending substantially in its longitudinal direction, as in the embodiment of FIG. 2, the tie rod can be omitted.

A horizontal pin of an operating member 17 movable like a transmission member of the servo motor 14 is engaged with this elongated hole. For this purpose, it is necessary for the intermediate lever 12' and the retaining member 17 to move within approximately one plane.

In FIG. 3, the elongated hole 16' of the intermediate lever 12'' is formed arcuate in its longitudinal direction, so that the transverse pin 18
It forms an arcuate connecting link. This is advantageous in order to obtain a predetermined steering geometry of the axis (Ackermann function).

In the embodiment shown in FIG. 4, the arm 5 and the lateral tie rod 15 act on the intermediate lever 12#' via a common joint 19.

FIG. 5 further shows that the intermediate lever 12"" has its pivot axis 1
It is formed in a curved shape when viewed in direction 3. At this time, both legs are bent outward.

In the case of a predetermined load (for example, the normal posture of the vehicle, the straight running position of the wheels), the tie rod 15 and the servo motor 14 are
To hold it against force, use the curved lever 1.
It is only necessary to tilt the upper leg 2" in such a way that the resultant force of the vertical force and any lateral tilting of the carrying spring 10 at the inner joint of the arm 5 is It is only necessary to tilt it so that it extends in the direction of this leg.

In the case of the embodiment described above, the intermediate lever 12.12'.

12" and 12" respectively face downward from the joint 13 on the vehicle body side. However, it may be arranged so as to face upward from the joint on the vehicle body side, that is, to be erected.

In the case of the embodiment shown in FIG. 6, an intermediate lever 20 is provided which is formed as a double-armed lever and is pivotally connected to the vehicle body 7 or the like in an intermediate range thereof.

At this time, a servo motor 14 acts on the upper end of the intermediate lever 20 via a lateral tie rod 15, and an arm 5 is pivotally attached to the lower end.

Furthermore, as shown in FIG. 7, in a two-wheel suspension of one axle, each rain intermediate lever 12 can be associated with its own servo motor 21. This servo motor operates the intermediate lever 12 via a lateral tie rod 15, or is itself supported by the vehicle body so as to be swingable about an axis extending in the longitudinal direction of the vehicle.

In FIG. 8, for a two-way wheel suspension on one axle, the intermediate levers 22, 23 are pivotally connected to each other via one yellow beam 24, and the nervomotor 14 is connected to the intermediate lever 22, 23.
It is acting on Furthermore, the servo motor 14 is connected to the horizontal beam 2.
It may be connected to 4.

Each of the transverse beams 24 extends somewhat beyond its pivot connection with the intermediate lever 22,23;
A movable Arno 5 is pivotally mounted to this extension. If the intermediate levers 22, 23 form an angle of 90 degrees to the transverse beam 24, this transverse beam always remains parallel to the starting position even when it is moved laterally. Thereby, the support of the arm 5 only has to absorb a smaller angle of rotation than if it were supported on the intermediate lever.

If the intermediate levers 22, 23 are not perpendicular to the transverse beam 24, the inner pivot points of the left and right arms 5 will undergo different lateral movements when one yellow beam moves laterally. Although this is kinematically desired, it results in a somewhat larger angle of rotation of the inner bearing of arm 5.

Embodiments of the invention are as follows.

1. Intermediate lever (12, 12') on the opposite side of the car body (7)
2. Wheel suspension according to claim 1, characterized in that the end of the intermediate lever is connected to the nervomotor (14) and the central region of the intermediate lever is connected to a movable arm (5).

2. The servo motor (14) is attached to the side tie rod (15)
2. Wheel suspension according to claim 1, characterized in that it acts on the intermediate lever (12) via the intermediate lever (12).

3. Wheel suspension according to claim 1, characterized in that the servo motor (14) acts on an elongated hole (16) of the intermediate lever (12"), which elongated hole extends substantially in the longitudinal direction of the intermediate lever. Device.

4. The wheel suspension device according to embodiment type 3, characterized in that the elongated hole (16') is formed in an arcuate shape in its longitudinal direction.

5. Wheel suspension according to embodiment type 2, characterized in that the arm (5) and the lateral tie rod (15) act on the intermediate lever (12'') via a common joint.

6. Intermediate lever (12, 12', 12"', 12"".

12#) extends downward from the joint 1-(13) on the vehicle body side.

7. Wheel suspension according to claim 1, characterized in that the intermediate lever (12'') is bent when viewed in the direction of its pivot axis (13).

8. The wheel suspension according to embodiment type 7, characterized in that both legs of the bent intermediate lever (12'') are bent outward.

9. The intermediate lever °-(20) is a double-armed lever '-,
2. A wheel suspension system according to claim 1, characterized in that a central region of the lever is pivotally connected to the vehicle body (7) or the like.

10. Axle with wheel suspension according to claim 1, characterized in that each of the rain intermediate levers (12) is flanked by its own servo motor (21).

11. The rain intermediate lever (22, 23) is the horizontal beam (24)
2. Axle with wheel suspension according to claim 1, characterized in that the servo motor (14) acts on one of the intermediate levers (22) or on the transverse beam, the servo motor (14) acting on one of the intermediate levers (22) or on the transverse beam.

12. The transverse beam (24) extends beyond its one-way connection with the intermediate lever (22, 23), and the movable arm is pivotally connected to this extension of the transverse beam (24). The axle according to embodiment type 11, characterized in that:

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the novel wheel suspension system, FIG. 2 is a partial view of another embodiment as seen in the direction of the arrow ■ in FIG. 1, and FIG.
The figure is a partial view similar to FIG. 2 of another embodiment, and FIGS. 4 to 8 are partial views similar to FIG. 2 of a modified embodiment. 1.'...Wheel, 2...Wheel carrier, 3゜4
．． 5.6...Wheel guide member (arm), 7...Car body, IO...Carrier spring, 11...Inner end of arm, 12.12', 12". 12", 20. ... Intermediate member, 13... Swing axis, 14... Servo motor, ■5... Vehicle longitudinal direction

Claims (1)

[Claims] 1. A wheel carrier supporting the wheels is provided, and this wheel carrier is connected to the vehicle body etc. via a plurality of wheel guide members,
In a wheel suspension for a steerable wheel, in particular a rear wheel, of a motor vehicle, in which one of the wheel guides acts as a tie rod and is movable by a servo motor, the movable wheel guide carries a spring (10). an arm (5) for supporting the vehicle, the inner end of which is pivotally connected to an intermediate lever (12, 12', 12'', 12'''', 20), which intermediate lever extends at least approximately in the longitudinal direction of the vehicle ( L)
A steerable wheel of a motor vehicle, in particular a rear wheel, characterized in that it is able to swing around a swing axis (13) on a vehicle body (7), etc., and is connected to a servo motor (14). Wheel suspension for wheels.